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Most paleontologists now agree that an asteroid did hit the Earth at approximately the end of the Cretaceous, but there is an ongoing dispute whether the impact was the sole cause of the extinctions. There is evidence that there was an interval of about 7012946728000000000â 300 ka from the impact to the mass extinction.
The Cretaceous (/krÉ¨ËteÉªÊÉs/ , krÉ-TAY-shÉs), derived from the Latin creta (chalk), usually abbreviated K for its German translation Kreide (chalk), is a geologic period and system from 145 Â± 4 to 66 million years (Ma) ago.n the geologic timescale, the Cretaceous follows the Jurassic Period and is followed by the Paleogene Period of the Cenozoic Era. It is the last period of the Mesozoic Era, and, spanning 79 million years, the longest period of the Phanerozoic Eon.